Resolve "list of subjects should contain columns dependent on the study"

added 7 commits

61a73e91 - datetime format is encoded (instead of pure ASCII characters transformed into string)
36423572 - study introduced as a concept - every StudySubject should be assigned to study
cf8cb1de - StudySubjectAddForm requires study parameter
6e8a6b5c - each study has a study columns object
e885aa34 - add/edit form for study subject use customized set of fields for given study
2c2ade01 - subject forms extracted to separate files
b30055b3 - set of columns visible in subject list is defined in database and provided by API

added 8 commits

be75c1e1 - statistic moths were checked for invalid year
f1578f05 - study introduced as a concept - every StudySubject should be assigned to study
ee8aefda - StudySubjectAddForm requires study parameter
c8f57af0 - each study has a study columns object
89058edd - add/edit form for study subject use customized set of fields for given study
ed1931da - subject forms extracted to separate files
b799344d - set of columns visible in subject list is defined in database and provided by API
a107e459 - Merge branch…

added 6 commits

f259c6d1 - unit test for checking if nd number validation works
770db4ca - obtaining list of visible fields simplified
365b00b4 - unit test for checking rendering of form with empty field list
be701969 - unnecessary to string methods removed
39ac1d9c - unit test checking if results are vali when no info about visible columns is available
5e4b4de6 - PEP issues

unmarked as a Work In Progress

added 2 commits

enabled an automatic merge when the pipeline for 9e91428e succeeds

mentioned in issue #193 (closed)

merged

mentioned in commit ba842f04

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